Knapsack or similar article



FIG. 1 is a perspective view of a knapsack or similar article showing mynew design;

FIG. 2 is a left front perspective view thereof with the closure flapsin open positions;

FIG. 3 is a rear elevational view of FIG. 1; and

FIG. 4 is a bottom plan view thereof.

The ornamental design for a knapsack or similar article, as shown ordescribed.